﻿using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Text;

namespace Common.saveIma
{
    public  class ImgHelper
    {


        /// <summary>
        /// 下载网站图片
        /// </summary>
        /// <param name="picUrl"></param>
        /// <returns></returns>
        public static string SaveAsWebImg(string picUrl)
        {
            string result = "";  
            string path = AppDomain.CurrentDomain.BaseDirectory + @"/File/";  //目录
            try
            {
                if (!String.IsNullOrEmpty(picUrl))
                {
                    Random rd = new Random();
                    DateTime nowTime = DateTime.Now;
                    string fileName = nowTime.Month.ToString() + nowTime.Day.ToString() + nowTime.Hour.ToString() + nowTime.Minute.ToString() + nowTime.Second.ToString() + rd.Next(1000, 1000000) + ".jpg";
                    WebClient webClient = new WebClient();
                    webClient.DownloadFile(picUrl, path + fileName);
                    result = fileName;
                }
            }
            catch(Exception ex) {
            }
            return result;

        }

            public static string SaveImageFromWeb(string imgUrl, string path, string fileName)
        {
            if (path.Equals(""))
                throw new Exception("未指定保存文件的路径");
            string imgName = imgUrl.ToString().Substring(imgUrl.ToString().LastIndexOf("/") + 1);
            string defaultType = ".jpg";
            string[] imgTypes = new string[] { ".jpg", ".jpeg", ".png", ".gif", ".bmp" };
            string imgType = imgUrl.ToString().Substring(imgUrl.ToString().LastIndexOf("."));
            string imgPath = "";
            foreach (string it in imgTypes)
            {
                if (imgType.ToLower().Equals(it))
                    break;
                if (it.Equals(".bmp"))
                    imgType = defaultType;
            }

            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(imgUrl);
            request.UserAgent = "Mozilla/6.0 (MSIE 6.0; Windows NT 5.1; Natas.Robot)";
            request.Timeout = 3000;

            WebResponse response = request.GetResponse();
            Stream stream = response.GetResponseStream();

            if (response.ContentType.ToLower().StartsWith("image/"))
            {
                byte[] arrayByte = new byte[1024];
                int imgLong = (int)response.ContentLength;
                int l = 0;

                if (fileName == "")
                    fileName = imgName;

                FileStream fso = new FileStream(path + fileName + imgType, FileMode.Create);
                while (l < imgLong)
                {
                    int i = stream.Read(arrayByte, 0, 1024);
                    fso.Write(arrayByte, 0, i);
                    l += i;
                }

                fso.Close();
                stream.Close();
                response.Close();
                imgPath = fileName + imgType;
                return imgPath;
            }
            else
            {
                return "";
            }
        }

    }
}
